/** * $RCSfile$ * $Revision$ * $Date$ * * Copyright 2003-2004 Jive Software. * * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.jivesoftware.smackx.muc; import org.jivesoftware.smack.*; import org.jivesoftware.smack.filter.*; import org.jivesoftware.smack.packet.*; import org.jivesoftware.smackx.Form; import org.jivesoftware.smackx.NodeInformationProvider; import org.jivesoftware.smackx.ServiceDiscoveryManager; import org.jivesoftware.smackx.packet.*; import java.lang.ref.WeakReference; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.util.*; import java.util.concurrent.ConcurrentHashMap; /** * A MultiUserChat is a conversation that takes place among many users in a virtual * room. A room could have many occupants with different affiliation and roles. * Possible affiliatons are "owner", "admin", "member", and "outcast". Possible roles * are "moderator", "participant", and "visitor". Each role and affiliation guarantees * different privileges (e.g. Send messages to all occupants, Kick participants and visitors, * Grant voice, Edit member list, etc.). * * @author Gaston Dombiak, Larry Kirschner */ public class MultiUserChat { private final static String discoNamespace = "http://jabber.org/protocol/muc"; private final static String discoNode = "http://jabber.org/protocol/muc#rooms"; private static Map> joinedRooms = new WeakHashMap>(); private XMPPConnection connection; private String room; private String subject; private String nickname = null; private boolean joined = false; private Map occupantsMap = new ConcurrentHashMap(); private final List invitationRejectionListeners = new ArrayList(); private final List subjectUpdatedListeners = new ArrayList(); private final List userStatusListeners = new ArrayList(); private final List participantStatusListeners = new ArrayList(); private PacketFilter presenceFilter; private List presenceInterceptors = new ArrayList(); private PacketFilter messageFilter; private RoomListenerMultiplexor roomListenerMultiplexor; private ConnectionDetachedPacketCollector messageCollector; private List connectionListeners = new ArrayList(); static { XMPPConnection.addConnectionCreationListener(new ConnectionCreationListener() { public void connectionCreated(final XMPPConnection connection) { // Set on every established connection that this client supports the Multi-User // Chat protocol. This information will be used when another client tries to // discover whether this client supports MUC or not. ServiceDiscoveryManager.getInstanceFor(connection).addFeature(discoNamespace); // Set the NodeInformationProvider that will provide information about the // joined rooms whenever a disco request is received ServiceDiscoveryManager.getInstanceFor(connection).setNodeInformationProvider( discoNode, new NodeInformationProvider() { public List getNodeItems() { List answer = new ArrayList(); Iterator rooms=MultiUserChat.getJoinedRooms(connection); while (rooms.hasNext()) { answer.add(new DiscoverItems.Item(rooms.next())); } return answer; } public List getNodeFeatures() { return null; } public List getNodeIdentities() { return null; } }); } }); } /** * Creates a new multi user chat with the specified connection and room name. Note: no * information is sent to or received from the server until you attempt to * {@link #join(String) join} the chat room. On some server implementations, * the room will not be created until the first person joins it.

* * Most XMPP servers use a sub-domain for the chat service (eg chat.example.com * for the XMPP server example.com). You must ensure that the room address you're * trying to connect to includes the proper chat sub-domain. * * @param connection the XMPP connection. * @param room the name of the room in the form "roomName@service", where * "service" is the hostname at which the multi-user chat * service is running. Make sure to provide a valid JID. */ public MultiUserChat(XMPPConnection connection, String room) { this.connection = connection; this.room = room.toLowerCase(); init(); } /** * Returns true if the specified user supports the Multi-User Chat protocol. * * @param connection the connection to use to perform the service discovery. * @param user the user to check. A fully qualified xmpp ID, e.g. jdoe@example.com. * @return a boolean indicating whether the specified user supports the MUC protocol. */ public static boolean isServiceEnabled(XMPPConnection connection, String user) { try { DiscoverInfo result = ServiceDiscoveryManager.getInstanceFor(connection).discoverInfo(user); return result.containsFeature(discoNamespace); } catch (XMPPException e) { e.printStackTrace(); return false; } } /** * Returns an Iterator on the rooms where the user has joined using a given connection. * The Iterator will contain Strings where each String represents a room * (e.g. room@muc.jabber.org). * * @param connection the connection used to join the rooms. * @return an Iterator on the rooms where the user has joined using a given connection. */ private static Iterator getJoinedRooms(XMPPConnection connection) { List rooms = joinedRooms.get(connection); if (rooms != null) { return rooms.iterator(); } // Return an iterator on an empty collection (i.e. the user never joined a room) return new ArrayList().iterator(); } /** * Returns an Iterator on the rooms where the requested user has joined. The Iterator will * contain Strings where each String represents a room (e.g. room@muc.jabber.org). * * @param connection the connection to use to perform the service discovery. * @param user the user to check. A fully qualified xmpp ID, e.g. jdoe@example.com. * @return an Iterator on the rooms where the requested user has joined. */ public static Iterator getJoinedRooms(XMPPConnection connection, String user) { try { ArrayList answer = new ArrayList(); // Send the disco packet to the user DiscoverItems result = ServiceDiscoveryManager.getInstanceFor(connection).discoverItems(user, discoNode); // Collect the entityID for each returned item for (Iterator items=result.getItems(); items.hasNext();) { answer.add(items.next().getEntityID()); } return answer.iterator(); } catch (XMPPException e) { e.printStackTrace(); // Return an iterator on an empty collection return new ArrayList().iterator(); } } /** * Returns the discovered information of a given room without actually having to join the room. * The server will provide information only for rooms that are public. * * @param connection the XMPP connection to use for discovering information about the room. * @param room the name of the room in the form "roomName@service" of which we want to discover * its information. * @return the discovered information of a given room without actually having to join the room. * @throws XMPPException if an error occured while trying to discover information of a room. */ public static RoomInfo getRoomInfo(XMPPConnection connection, String room) throws XMPPException { DiscoverInfo info = ServiceDiscoveryManager.getInstanceFor(connection).discoverInfo(room); return new RoomInfo(info); } /** * Returns a collection with the XMPP addresses of the Multi-User Chat services. * * @param connection the XMPP connection to use for discovering Multi-User Chat services. * @return a collection with the XMPP addresses of the Multi-User Chat services. * @throws XMPPException if an error occured while trying to discover MUC services. */ public static Collection getServiceNames(XMPPConnection connection) throws XMPPException { final List answer = new ArrayList(); ServiceDiscoveryManager discoManager = ServiceDiscoveryManager.getInstanceFor(connection); DiscoverItems items = discoManager.discoverItems(connection.getServiceName()); for (Iterator it = items.getItems(); it.hasNext();) { DiscoverItems.Item item = it.next(); try { DiscoverInfo info = discoManager.discoverInfo(item.getEntityID()); if (info.containsFeature("http://jabber.org/protocol/muc")) { answer.add(item.getEntityID()); } } catch (XMPPException e) { // Trouble finding info in some cases. This is a workaround for // discovering info on remote servers. } } return answer; } /** * Returns a collection of HostedRooms where each HostedRoom has the XMPP address of the room * and the room's name. Once discovered the rooms hosted by a chat service it is possible to * discover more detailed room information or join the room. * * @param connection the XMPP connection to use for discovering hosted rooms by the MUC service. * @param serviceName the service that is hosting the rooms to discover. * @return a collection of HostedRooms. * @throws XMPPException if an error occured while trying to discover the information. */ public static Collection getHostedRooms(XMPPConnection connection, String serviceName) throws XMPPException { List answer = new ArrayList(); ServiceDiscoveryManager discoManager = ServiceDiscoveryManager.getInstanceFor(connection); DiscoverItems items = discoManager.discoverItems(serviceName); for (Iterator it = items.getItems(); it.hasNext();) { answer.add(new HostedRoom(it.next())); } return answer; } /** * Returns the name of the room this MultiUserChat object represents. * * @return the multi user chat room name. */ public String getRoom() { return room; } /** * Creates the room according to some default configuration, assign the requesting user * as the room owner, and add the owner to the room but not allow anyone else to enter * the room (effectively "locking" the room). The requesting user will join the room * under the specified nickname as soon as the room has been created.

* * To create an "Instant Room", that means a room with some default configuration that is * available for immediate access, the room's owner should send an empty form after creating * the room. {@link #sendConfigurationForm(Form)}

* * To create a "Reserved Room", that means a room manually configured by the room creator * before anyone is allowed to enter, the room's owner should complete and send a form after * creating the room. Once the completed configutation form is sent to the server, the server * will unlock the room. {@link #sendConfigurationForm(Form)} * * @param nickname the nickname to use. * @throws XMPPException if the room couldn't be created for some reason * (e.g. room already exists; user already joined to an existant room or * 405 error if the user is not allowed to create the room) */ public synchronized void create(String nickname) throws XMPPException { if (nickname == null || nickname.equals("")) { throw new IllegalArgumentException("Nickname must not be null or blank."); } // If we've already joined the room, leave it before joining under a new // nickname. if (joined) { throw new IllegalStateException("Creation failed - User already joined the room."); } // We create a room by sending a presence packet to room@service/nick // and signal support for MUC. The owner will be automatically logged into the room. Presence joinPresence = new Presence(Presence.Type.available); joinPresence.setTo(room + "/" + nickname); // Indicate the the client supports MUC joinPresence.addExtension(new MUCInitialPresence()); // Invoke presence interceptors so that extra information can be dynamically added for (PacketInterceptor packetInterceptor : presenceInterceptors) { packetInterceptor.interceptPacket(joinPresence); } // Wait for a presence packet back from the server. PacketFilter responseFilter = new AndFilter( new FromMatchesFilter(room + "/" + nickname), new PacketTypeFilter(Presence.class)); PacketCollector response = connection.createPacketCollector(responseFilter); // Send create & join packet. connection.sendPacket(joinPresence); // Wait up to a certain number of seconds for a reply. Presence presence = (Presence) response.nextResult(SmackConfiguration.getPacketReplyTimeout()); // Stop queuing results response.cancel(); if (presence == null) { throw new XMPPException("No response from server."); } else if (presence.getError() != null) { throw new XMPPException(presence.getError()); } // Whether the room existed before or was created, the user has joined the room this.nickname = nickname; joined = true; userHasJoined(); // Look for confirmation of room creation from the server MUCUser mucUser = getMUCUserExtension(presence); if (mucUser != null && mucUser.getStatus() != null) { if ("201".equals(mucUser.getStatus().getCode())) { // Room was created and the user has joined the room return; } } // We need to leave the room since it seems that the room already existed leave(); throw new XMPPException("Creation failed - Missing acknowledge of room creation."); } /** * Joins the chat room using the specified nickname. If already joined * using another nickname, this method will first leave the room and then * re-join using the new nickname. The default timeout of Smack for a reply * from the group chat server that the join succeeded will be used. After * joining the room, the room will decide the amount of history to send. * * @param nickname the nickname to use. * @throws XMPPException if an error occurs joining the room. In particular, a * 401 error can occur if no password was provided and one is required; or a * 403 error can occur if the user is banned; or a * 404 error can occur if the room does not exist or is locked; or a * 407 error can occur if user is not on the member list; or a * 409 error can occur if someone is already in the group chat with the same nickname. */ public void join(String nickname) throws XMPPException { join(nickname, null, null, SmackConfiguration.getPacketReplyTimeout()); } /** * Joins the chat room using the specified nickname and password. If already joined * using another nickname, this method will first leave the room and then * re-join using the new nickname. The default timeout of Smack for a reply * from the group chat server that the join succeeded will be used. After * joining the room, the room will decide the amount of history to send.

* * A password is required when joining password protected rooms. If the room does * not require a password there is no need to provide one. * * @param nickname the nickname to use. * @param password the password to use. * @throws XMPPException if an error occurs joining the room. In particular, a * 401 error can occur if no password was provided and one is required; or a * 403 error can occur if the user is banned; or a * 404 error can occur if the room does not exist or is locked; or a * 407 error can occur if user is not on the member list; or a * 409 error can occur if someone is already in the group chat with the same nickname. */ public void join(String nickname, String password) throws XMPPException { join(nickname, password, null, SmackConfiguration.getPacketReplyTimeout()); } /** * Joins the chat room using the specified nickname and password. If already joined * using another nickname, this method will first leave the room and then * re-join using the new nickname.

* * To control the amount of history to receive while joining a room you will need to provide * a configured DiscussionHistory object.

* * A password is required when joining password protected rooms. If the room does * not require a password there is no need to provide one.

* * If the room does not already exist when the user seeks to enter it, the server will * decide to create a new room or not. * * @param nickname the nickname to use. * @param password the password to use. * @param history the amount of discussion history to receive while joining a room. * @param timeout the amount of time to wait for a reply from the MUC service(in milleseconds). * @throws XMPPException if an error occurs joining the room. In particular, a * 401 error can occur if no password was provided and one is required; or a * 403 error can occur if the user is banned; or a * 404 error can occur if the room does not exist or is locked; or a * 407 error can occur if user is not on the member list; or a * 409 error can occur if someone is already in the group chat with the same nickname. */ public synchronized void join( String nickname, String password, DiscussionHistory history, long timeout) throws XMPPException { if (nickname == null || nickname.equals("")) { throw new IllegalArgumentException("Nickname must not be null or blank."); } // If we've already joined the room, leave it before joining under a new // nickname. if (joined) { leave(); } // We join a room by sending a presence packet where the "to" // field is in the form "roomName@service/nickname" Presence joinPresence = new Presence(Presence.Type.available); joinPresence.setTo(room + "/" + nickname); // Indicate the the client supports MUC MUCInitialPresence mucInitialPresence = new MUCInitialPresence(); if (password != null) { mucInitialPresence.setPassword(password); } if (history != null) { mucInitialPresence.setHistory(history.getMUCHistory()); } joinPresence.addExtension(mucInitialPresence); // Invoke presence interceptors so that extra information can be dynamically added for (PacketInterceptor packetInterceptor : presenceInterceptors) { packetInterceptor.interceptPacket(joinPresence); } // Wait for a presence packet back from the server. PacketFilter responseFilter = new AndFilter( new FromMatchesFilter(room + "/" + nickname), new PacketTypeFilter(Presence.class)); PacketCollector response = connection.createPacketCollector(responseFilter); // Send join packet. connection.sendPacket(joinPresence); // Wait up to a certain number of seconds for a reply. Presence presence = (Presence) response.nextResult(timeout); // Stop queuing results response.cancel(); if (presence == null) { throw new XMPPException("No response from server."); } else if (presence.getError() != null) { throw new XMPPException(presence.getError()); } this.nickname = nickname; joined = true; userHasJoined(); } /** * Returns true if currently in the multi user chat (after calling the {@link * #join(String)} method). * * @return true if currently in the multi user chat room. */ public boolean isJoined() { return joined; } /** * Leave the chat room. */ public synchronized void leave() { // If not joined already, do nothing. if (!joined) { return; } // We leave a room by sending a presence packet where the "to" // field is in the form "roomName@service/nickname" Presence leavePresence = new Presence(Presence.Type.unavailable); leavePresence.setTo(room + "/" + nickname); // Invoke presence interceptors so that extra information can be dynamically added for (PacketInterceptor packetInterceptor : presenceInterceptors) { packetInterceptor.interceptPacket(leavePresence); } connection.sendPacket(leavePresence); // Reset occupant information. occupantsMap.clear(); nickname = null; joined = false; userHasLeft(); } /** * Returns the room's configuration form that the room's owner can use or null if * no configuration is possible. The configuration form allows to set the room's language, * enable logging, specify room's type, etc.. * * @return the Form that contains the fields to complete together with the instrucions or * null if no configuration is possible. * @throws XMPPException if an error occurs asking the configuration form for the room. */ public Form getConfigurationForm() throws XMPPException { MUCOwner iq = new MUCOwner(); iq.setTo(room); iq.setType(IQ.Type.GET); // Filter packets looking for an answer from the server. PacketFilter responseFilter = new PacketIDFilter(iq.getPacketID()); PacketCollector response = connection.createPacketCollector(responseFilter); // Request the configuration form to the server. connection.sendPacket(iq); // Wait up to a certain number of seconds for a reply. IQ answer = (IQ) response.nextResult(SmackConfiguration.getPacketReplyTimeout()); // Stop queuing results response.cancel(); if (answer == null) { throw new XMPPException("No response from server."); } else if (answer.getError() != null) { throw new XMPPException(answer.getError()); } return Form.getFormFrom(answer); } /** * Sends the completed configuration form to the server. The room will be configured * with the new settings defined in the form. If the form is empty then the server * will create an instant room (will use default configuration). * * @param form the form with the new settings. * @throws XMPPException if an error occurs setting the new rooms' configuration. */ public void sendConfigurationForm(Form form) throws XMPPException { MUCOwner iq = new MUCOwner(); iq.setTo(room); iq.setType(IQ.Type.SET); iq.addExtension(form.getDataFormToSend()); // Filter packets looking for an answer from the server. PacketFilter responseFilter = new PacketIDFilter(iq.getPacketID()); PacketCollector response = connection.createPacketCollector(responseFilter); // Send the completed configuration form to the server. connection.sendPacket(iq); // Wait up to a certain number of seconds for a reply. IQ answer = (IQ) response.nextResult(SmackConfiguration.getPacketReplyTimeout()); // Stop queuing results response.cancel(); if (answer == null) { throw new XMPPException("No response from server."); } else if (answer.getError() != null) { throw new XMPPException(answer.getError()); } } /** * Returns the room's registration form that an unaffiliated user, can use to become a member * of the room or null if no registration is possible. Some rooms may restrict the * privilege to register members and allow only room admins to add new members.

* * If the user requesting registration requirements is not allowed to register with the room * (e.g. because that privilege has been restricted), the room will return a "Not Allowed" * error to the user (error code 405). * * @return the registration Form that contains the fields to complete together with the * instrucions or null if no registration is possible. * @throws XMPPException if an error occurs asking the registration form for the room or a * 405 error if the user is not allowed to register with the room. */ public Form getRegistrationForm() throws XMPPException { Registration reg = new Registration(); reg.setType(IQ.Type.GET); reg.setTo(room); PacketFilter filter = new AndFilter(new PacketIDFilter(reg.getPacketID()), new PacketTypeFilter(IQ.class)); PacketCollector collector = connection.createPacketCollector(filter); connection.sendPacket(reg); IQ result = (IQ) collector.nextResult(SmackConfiguration.getPacketReplyTimeout()); collector.cancel(); if (result == null) { throw new XMPPException("No response from server."); } else if (result.getType() == IQ.Type.ERROR) { throw new XMPPException(result.getError()); } return Form.getFormFrom(result); } /** * Sends the completed registration form to the server. After the user successfully submits * the form, the room may queue the request for review by the room admins or may immediately * add the user to the member list by changing the user's affiliation from "none" to "member.

* * If the desired room nickname is already reserved for that room, the room will return a * "Conflict" error to the user (error code 409). If the room does not support registration, * it will return a "Service Unavailable" error to the user (error code 503). * * @param form the completed registration form. * @throws XMPPException if an error occurs submitting the registration form. In particular, a * 409 error can occur if the desired room nickname is already reserved for that room; * or a 503 error can occur if the room does not support registration. */ public void sendRegistrationForm(Form form) throws XMPPException { Registration reg = new Registration(); reg.setType(IQ.Type.SET); reg.setTo(room); reg.addExtension(form.getDataFormToSend()); PacketFilter filter = new AndFilter(new PacketIDFilter(reg.getPacketID()), new PacketTypeFilter(IQ.class)); PacketCollector collector = connection.createPacketCollector(filter); connection.sendPacket(reg); IQ result = (IQ) collector.nextResult(SmackConfiguration.getPacketReplyTimeout()); collector.cancel(); if (result == null) { throw new XMPPException("No response from server."); } else if (result.getType() == IQ.Type.ERROR) { throw new XMPPException(result.getError()); } } /** * Sends a request to the server to destroy the room. The sender of the request * should be the room's owner. If the sender of the destroy request is not the room's owner * then the server will answer a "Forbidden" error (403). * * @param reason the reason for the room destruction. * @param alternateJID the JID of an alternate location. * @throws XMPPException if an error occurs while trying to destroy the room. * An error can occur which will be wrapped by an XMPPException -- * XMPP error code 403. The error code can be used to present more * appropiate error messages to end-users. */ public void destroy(String reason, String alternateJID) throws XMPPException { MUCOwner iq = new MUCOwner(); iq.setTo(room); iq.setType(IQ.Type.SET); // Create the reason for the room destruction MUCOwner.Destroy destroy = new MUCOwner.Destroy(); destroy.setReason(reason); destroy.setJid(alternateJID); iq.setDestroy(destroy); // Wait for a presence packet back from the server. PacketFilter responseFilter = new PacketIDFilter(iq.getPacketID()); PacketCollector response = connection.createPacketCollector(responseFilter); // Send the room destruction request. connection.sendPacket(iq); // Wait up to a certain number of seconds for a reply. IQ answer = (IQ) response.nextResult(SmackConfiguration.getPacketReplyTimeout()); // Stop queuing results response.cancel(); if (answer == null) { throw new XMPPException("No response from server."); } else if (answer.getError() != null) { throw new XMPPException(answer.getError()); } // Reset occupant information. occupantsMap.clear(); nickname = null; joined = false; userHasLeft(); } /** * Invites another user to the room in which one is an occupant. The invitation * will be sent to the room which in turn will forward the invitation to the invitee.

* * If the room is password-protected, the invitee will receive a password to use to join * the room. If the room is members-only, the the invitee may be added to the member list. * * @param user the user to invite to the room.(e.g. hecate@shakespeare.lit) * @param reason the reason why the user is being invited. */ public void invite(String user, String reason) { invite(new Message(), user, reason); } /** * Invites another user to the room in which one is an occupant using a given Message. The invitation * will be sent to the room which in turn will forward the invitation to the invitee.

* * If the room is password-protected, the invitee will receive a password to use to join * the room. If the room is members-only, the the invitee may be added to the member list. * * @param message the message to use for sending the invitation. * @param user the user to invite to the room.(e.g. hecate@shakespeare.lit) * @param reason the reason why the user is being invited. */ public void invite(Message message, String user, String reason) { // TODO listen for 404 error code when inviter supplies a non-existent JID message.setTo(room); // Create the MUCUser packet that will include the invitation MUCUser mucUser = new MUCUser(); MUCUser.Invite invite = new MUCUser.Invite(); invite.setTo(user); invite.setReason(reason); mucUser.setInvite(invite); // Add the MUCUser packet that includes the invitation to the message message.addExtension(mucUser); connection.sendPacket(message); } /** * Informs the sender of an invitation that the invitee declines the invitation. The rejection * will be sent to the room which in turn will forward the rejection to the inviter. * * @param conn the connection to use for sending the rejection. * @param room the room that sent the original invitation. * @param inviter the inviter of the declined invitation. * @param reason the reason why the invitee is declining the invitation. */ public static void decline(XMPPConnection conn, String room, String inviter, String reason) { Message message = new Message(room); // Create the MUCUser packet that will include the rejection MUCUser mucUser = new MUCUser(); MUCUser.Decline decline = new MUCUser.Decline(); decline.setTo(inviter); decline.setReason(reason); mucUser.setDecline(decline); // Add the MUCUser packet that includes the rejection message.addExtension(mucUser); conn.sendPacket(message); } /** * Adds a listener to invitation notifications. The listener will be fired anytime * an invitation is received. * * @param conn the connection where the listener will be applied. * @param listener an invitation listener. */ public static void addInvitationListener(XMPPConnection conn, InvitationListener listener) { InvitationsMonitor.getInvitationsMonitor(conn).addInvitationListener(listener); } /** * Removes a listener to invitation notifications. The listener will be fired anytime * an invitation is received. * * @param conn the connection where the listener was applied. * @param listener an invitation listener. */ public static void removeInvitationListener(XMPPConnection conn, InvitationListener listener) { InvitationsMonitor.getInvitationsMonitor(conn).removeInvitationListener(listener); } /** * Adds a listener to invitation rejections notifications. The listener will be fired anytime * an invitation is declined. * * @param listener an invitation rejection listener. */ public void addInvitationRejectionListener(InvitationRejectionListener listener) { synchronized (invitationRejectionListeners) { if (!invitationRejectionListeners.contains(listener)) { invitationRejectionListeners.add(listener); } } } /** * Removes a listener from invitation rejections notifications. The listener will be fired * anytime an invitation is declined. * * @param listener an invitation rejection listener. */ public void removeInvitationRejectionListener(InvitationRejectionListener listener) { synchronized (invitationRejectionListeners) { invitationRejectionListeners.remove(listener); } } /** * Fires invitation rejection listeners. */ private void fireInvitationRejectionListeners(String invitee, String reason) { InvitationRejectionListener[] listeners; synchronized (invitationRejectionListeners) { listeners = new InvitationRejectionListener[invitationRejectionListeners.size()]; invitationRejectionListeners.toArray(listeners); } for (InvitationRejectionListener listener : listeners) { listener.invitationDeclined(invitee, reason); } } /** * Adds a listener to subject change notifications. The listener will be fired anytime * the room's subject changes. * * @param listener a subject updated listener. */ public void addSubjectUpdatedListener(SubjectUpdatedListener listener) { synchronized (subjectUpdatedListeners) { if (!subjectUpdatedListeners.contains(listener)) { subjectUpdatedListeners.add(listener); } } } /** * Removes a listener from subject change notifications. The listener will be fired * anytime the room's subject changes. * * @param listener a subject updated listener. */ public void removeSubjectUpdatedListener(SubjectUpdatedListener listener) { synchronized (subjectUpdatedListeners) { subjectUpdatedListeners.remove(listener); } } /** * Fires subject updated listeners. */ private void fireSubjectUpdatedListeners(String subject, String from) { SubjectUpdatedListener[] listeners; synchronized (subjectUpdatedListeners) { listeners = new SubjectUpdatedListener[subjectUpdatedListeners.size()]; subjectUpdatedListeners.toArray(listeners); } for (SubjectUpdatedListener listener : listeners) { listener.subjectUpdated(subject, from); } } /** * Adds a new {@link PacketInterceptor} that will be invoked every time a new presence * is going to be sent by this MultiUserChat to the server. Packet interceptors may * add new extensions to the presence that is going to be sent to the MUC service. * * @param presenceInterceptor the new packet interceptor that will intercept presence packets. */ public void addPresenceInterceptor(PacketInterceptor presenceInterceptor) { presenceInterceptors.add(presenceInterceptor); } /** * Removes a {@link PacketInterceptor} that was being invoked every time a new presence * was being sent by this MultiUserChat to the server. Packet interceptors may * add new extensions to the presence that is going to be sent to the MUC service. * * @param presenceInterceptor the packet interceptor to remove. */ public void removePresenceInterceptor(PacketInterceptor presenceInterceptor) { presenceInterceptors.remove(presenceInterceptor); } /** * Returns the last known room's subject or null if the user hasn't joined the room * or the room does not have a subject yet. In case the room has a subject, as soon as the * user joins the room a message with the current room's subject will be received.

* * To be notified every time the room's subject change you should add a listener * to this room. {@link #addSubjectUpdatedListener(SubjectUpdatedListener)}

* * To change the room's subject use {@link #changeSubject(String)}. * * @return the room's subject or null if the user hasn't joined the room or the * room does not have a subject yet. */ public String getSubject() { return subject; } /** * Returns the reserved room nickname for the user in the room. A user may have a reserved * nickname, for example through explicit room registration or database integration. In such * cases it may be desirable for the user to discover the reserved nickname before attempting * to enter the room. * * @return the reserved room nickname or null if none. */ public String getReservedNickname() { try { DiscoverInfo result = ServiceDiscoveryManager.getInstanceFor(connection).discoverInfo( room, "x-roomuser-item"); // Look for an Identity that holds the reserved nickname and return its name for (Iterator identities = result.getIdentities(); identities.hasNext();) { DiscoverInfo.Identity identity = identities.next(); return identity.getName(); } // If no Identity was found then the user does not have a reserved room nickname return null; } catch (XMPPException e) { e.printStackTrace(); return null; } } /** * Returns the nickname that was used to join the room, or null if not * currently joined. * * @return the nickname currently being used. */ public String getNickname() { return nickname; } /** * Changes the occupant's nickname to a new nickname within the room. Each room occupant * will receive two presence packets. One of type "unavailable" for the old nickname and one * indicating availability for the new nickname. The unavailable presence will contain the new * nickname and an appropriate status code (namely 303) as extended presence information. The * status code 303 indicates that the occupant is changing his/her nickname. * * @param nickname the new nickname within the room. * @throws XMPPException if the new nickname is already in use by another occupant. */ public void changeNickname(String nickname) throws XMPPException { if (nickname == null || nickname.equals("")) { throw new IllegalArgumentException("Nickname must not be null or blank."); } // Check that we already have joined the room before attempting to change the // nickname. if (!joined) { throw new IllegalStateException("Must be logged into the room to change nickname."); } // We change the nickname by sending a presence packet where the "to" // field is in the form "roomName@service/nickname" // We don't have to signal the MUC support again Presence joinPresence = new Presence(Presence.Type.available); joinPresence.setTo(room + "/" + nickname); // Invoke presence interceptors so that extra information can be dynamically added for (PacketInterceptor packetInterceptor : presenceInterceptors) { packetInterceptor.interceptPacket(joinPresence); } // Wait for a presence packet back from the server. PacketFilter responseFilter = new AndFilter( new FromMatchesFilter(room + "/" + nickname), new PacketTypeFilter(Presence.class)); PacketCollector response = connection.createPacketCollector(responseFilter); // Send join packet. connection.sendPacket(joinPresence); // Wait up to a certain number of seconds for a reply. Presence presence = (Presence) response.nextResult(SmackConfiguration.getPacketReplyTimeout()); // Stop queuing results response.cancel(); if (presence == null) { throw new XMPPException("No response from server."); } else if (presence.getError() != null) { throw new XMPPException(presence.getError()); } this.nickname = nickname; } /** * Changes the occupant's availability status within the room. The presence type * will remain available but with a new status that describes the presence update and * a new presence mode (e.g. Extended away). * * @param status a text message describing the presence update. * @param mode the mode type for the presence update. */ public void changeAvailabilityStatus(String status, Presence.Mode mode) { if (nickname == null || nickname.equals("")) { throw new IllegalArgumentException("Nickname must not be null or blank."); } // Check that we already have joined the room before attempting to change the // availability status. if (!joined) { throw new IllegalStateException( "Must be logged into the room to change the " + "availability status."); } // We change the availability status by sending a presence packet to the room with the // new presence status and mode Presence joinPresence = new Presence(Presence.Type.available); joinPresence.setStatus(status); joinPresence.setMode(mode); joinPresence.setTo(room + "/" + nickname); // Invoke presence interceptors so that extra information can be dynamically added for (PacketInterceptor packetInterceptor : presenceInterceptors) { packetInterceptor.interceptPacket(joinPresence); } // Send join packet. connection.sendPacket(joinPresence); } /** * Kicks a visitor or participant from the room. The kicked occupant will receive a presence * of type "unavailable" including a status code 307 and optionally along with the reason * (if provided) and the bare JID of the user who initiated the kick. After the occupant * was kicked from the room, the rest of the occupants will receive a presence of type * "unavailable". The presence will include a status code 307 which means that the occupant * was kicked from the room. * * @param nickname the nickname of the participant or visitor to kick from the room * (e.g. "john"). * @param reason the reason why the participant or visitor is being kicked from the room. * @throws XMPPException if an error occurs kicking the occupant. In particular, a * 405 error can occur if a moderator or a user with an affiliation of "owner" or "admin" * was intended to be kicked (i.e. Not Allowed error); or a * 403 error can occur if the occupant that intended to kick another occupant does * not have kicking privileges (i.e. Forbidden error); or a * 400 error can occur if the provided nickname is not present in the room. */ public void kickParticipant(String nickname, String reason) throws XMPPException { changeRole(nickname, "none", reason); } /** * Grants voice to visitors in the room. In a moderated room, a moderator may want to manage * who does and does not have "voice" in the room. To have voice means that a room occupant * is able to send messages to the room occupants. * * @param nicknames the nicknames of the visitors to grant voice in the room (e.g. "john"). * @throws XMPPException if an error occurs granting voice to a visitor. In particular, a * 403 error can occur if the occupant that intended to grant voice is not * a moderator in this room (i.e. Forbidden error); or a * 400 error can occur if the provided nickname is not present in the room. */ public void grantVoice(Collection nicknames) throws XMPPException { changeRole(nicknames, "participant"); } /** * Grants voice to a visitor in the room. In a moderated room, a moderator may want to manage * who does and does not have "voice" in the room. To have voice means that a room occupant * is able to send messages to the room occupants. * * @param nickname the nickname of the visitor to grant voice in the room (e.g. "john"). * @throws XMPPException if an error occurs granting voice to a visitor. In particular, a * 403 error can occur if the occupant that intended to grant voice is not * a moderator in this room (i.e. Forbidden error); or a * 400 error can occur if the provided nickname is not present in the room. */ public void grantVoice(String nickname) throws XMPPException { changeRole(nickname, "participant", null); } /** * Revokes voice from participants in the room. In a moderated room, a moderator may want to * revoke an occupant's privileges to speak. To have voice means that a room occupant * is able to send messages to the room occupants. * * @param nicknames the nicknames of the participants to revoke voice (e.g. "john"). * @throws XMPPException if an error occurs revoking voice from a participant. In particular, a * 405 error can occur if a moderator or a user with an affiliation of "owner" or "admin" * was tried to revoke his voice (i.e. Not Allowed error); or a * 400 error can occur if the provided nickname is not present in the room. */ public void revokeVoice(Collection nicknames) throws XMPPException { changeRole(nicknames, "visitor"); } /** * Revokes voice from a participant in the room. In a moderated room, a moderator may want to * revoke an occupant's privileges to speak. To have voice means that a room occupant * is able to send messages to the room occupants. * * @param nickname the nickname of the participant to revoke voice (e.g. "john"). * @throws XMPPException if an error occurs revoking voice from a participant. In particular, a * 405 error can occur if a moderator or a user with an affiliation of "owner" or "admin" * was tried to revoke his voice (i.e. Not Allowed error); or a * 400 error can occur if the provided nickname is not present in the room. */ public void revokeVoice(String nickname) throws XMPPException { changeRole(nickname, "visitor", null); } /** * Bans users from the room. An admin or owner of the room can ban users from a room. This * means that the banned user will no longer be able to join the room unless the ban has been * removed. If the banned user was present in the room then he/she will be removed from the * room and notified that he/she was banned along with the reason (if provided) and the bare * XMPP user ID of the user who initiated the ban. * * @param jids the bare XMPP user IDs of the users to ban. * @throws XMPPException if an error occurs banning a user. In particular, a * 405 error can occur if a moderator or a user with an affiliation of "owner" or "admin" * was tried to be banned (i.e. Not Allowed error). */ public void banUsers(Collection jids) throws XMPPException { changeAffiliationByAdmin(jids, "outcast"); } /** * Bans a user from the room. An admin or owner of the room can ban users from a room. This * means that the banned user will no longer be able to join the room unless the ban has been * removed. If the banned user was present in the room then he/she will be removed from the * room and notified that he/she was banned along with the reason (if provided) and the bare * XMPP user ID of the user who initiated the ban. * * @param jid the bare XMPP user ID of the user to ban (e.g. "user@host.org"). * @param reason the reason why the user was banned. * @throws XMPPException if an error occurs banning a user. In particular, a * 405 error can occur if a moderator or a user with an affiliation of "owner" or "admin" * was tried to be banned (i.e. Not Allowed error). */ public void banUser(String jid, String reason) throws XMPPException { changeAffiliationByAdmin(jid, "outcast", reason); } /** * Grants membership to other users. Only administrators are able to grant membership. A user * that becomes a room member will be able to enter a room of type Members-Only (i.e. a room * that a user cannot enter without being on the member list). * * @param jids the XMPP user IDs of the users to grant membership. * @throws XMPPException if an error occurs granting membership to a user. */ public void grantMembership(Collection jids) throws XMPPException { changeAffiliationByAdmin(jids, "member"); } /** * Grants membership to a user. Only administrators are able to grant membership. A user * that becomes a room member will be able to enter a room of type Members-Only (i.e. a room * that a user cannot enter without being on the member list). * * @param jid the XMPP user ID of the user to grant membership (e.g. "user@host.org"). * @throws XMPPException if an error occurs granting membership to a user. */ public void grantMembership(String jid) throws XMPPException { changeAffiliationByAdmin(jid, "member", null); } /** * Revokes users' membership. Only administrators are able to revoke membership. A user * that becomes a room member will be able to enter a room of type Members-Only (i.e. a room * that a user cannot enter without being on the member list). If the user is in the room and * the room is of type members-only then the user will be removed from the room. * * @param jids the bare XMPP user IDs of the users to revoke membership. * @throws XMPPException if an error occurs revoking membership to a user. */ public void revokeMembership(Collection jids) throws XMPPException { changeAffiliationByAdmin(jids, "none"); } /** * Revokes a user's membership. Only administrators are able to revoke membership. A user * that becomes a room member will be able to enter a room of type Members-Only (i.e. a room * that a user cannot enter without being on the member list). If the user is in the room and * the room is of type members-only then the user will be removed from the room. * * @param jid the bare XMPP user ID of the user to revoke membership (e.g. "user@host.org"). * @throws XMPPException if an error occurs revoking membership to a user. */ public void revokeMembership(String jid) throws XMPPException { changeAffiliationByAdmin(jid, "none", null); } /** * Grants moderator privileges to participants or visitors. Room administrators may grant * moderator privileges. A moderator is allowed to kick users, grant and revoke voice, invite * other users, modify room's subject plus all the partcipants privileges. * * @param nicknames the nicknames of the occupants to grant moderator privileges. * @throws XMPPException if an error occurs granting moderator privileges to a user. */ public void grantModerator(Collection nicknames) throws XMPPException { changeRole(nicknames, "moderator"); } /** * Grants moderator privileges to a participant or visitor. Room administrators may grant * moderator privileges. A moderator is allowed to kick users, grant and revoke voice, invite * other users, modify room's subject plus all the partcipants privileges. * * @param nickname the nickname of the occupant to grant moderator privileges. * @throws XMPPException if an error occurs granting moderator privileges to a user. */ public void grantModerator(String nickname) throws XMPPException { changeRole(nickname, "moderator", null); } /** * Revokes moderator privileges from other users. The occupant that loses moderator * privileges will become a participant. Room administrators may revoke moderator privileges * only to occupants whose affiliation is member or none. This means that an administrator is * not allowed to revoke moderator privileges from other room administrators or owners. * * @param nicknames the nicknames of the occupants to revoke moderator privileges. * @throws XMPPException if an error occurs revoking moderator privileges from a user. */ public void revokeModerator(Collection nicknames) throws XMPPException { changeRole(nicknames, "participant"); } /** * Revokes moderator privileges from another user. The occupant that loses moderator * privileges will become a participant. Room administrators may revoke moderator privileges * only to occupants whose affiliation is member or none. This means that an administrator is * not allowed to revoke moderator privileges from other room administrators or owners. * * @param nickname the nickname of the occupant to revoke moderator privileges. * @throws XMPPException if an error occurs revoking moderator privileges from a user. */ public void revokeModerator(String nickname) throws XMPPException { changeRole(nickname, "participant", null); } /** * Grants ownership privileges to other users. Room owners may grant ownership privileges. * Some room implementations will not allow to grant ownership privileges to other users. * An owner is allowed to change defining room features as well as perform all administrative * functions. * * @param jids the collection of bare XMPP user IDs of the users to grant ownership. * @throws XMPPException if an error occurs granting ownership privileges to a user. */ public void grantOwnership(Collection jids) throws XMPPException { changeAffiliationByOwner(jids, "owner"); } /** * Grants ownership privileges to another user. Room owners may grant ownership privileges. * Some room implementations will not allow to grant ownership privileges to other users. * An owner is allowed to change defining room features as well as perform all administrative * functions. * * @param jid the bare XMPP user ID of the user to grant ownership (e.g. "user@host.org"). * @throws XMPPException if an error occurs granting ownership privileges to a user. */ public void grantOwnership(String jid) throws XMPPException { changeAffiliationByOwner(jid, "owner"); } /** * Revokes ownership privileges from other users. The occupant that loses ownership * privileges will become an administrator. Room owners may revoke ownership privileges. * Some room implementations will not allow to grant ownership privileges to other users. * * @param jids the bare XMPP user IDs of the users to revoke ownership. * @throws XMPPException if an error occurs revoking ownership privileges from a user. */ public void revokeOwnership(Collection jids) throws XMPPException { changeAffiliationByOwner(jids, "admin"); } /** * Revokes ownership privileges from another user. The occupant that loses ownership * privileges will become an administrator. Room owners may revoke ownership privileges. * Some room implementations will not allow to grant ownership privileges to other users. * * @param jid the bare XMPP user ID of the user to revoke ownership (e.g. "user@host.org"). * @throws XMPPException if an error occurs revoking ownership privileges from a user. */ public void revokeOwnership(String jid) throws XMPPException { changeAffiliationByOwner(jid, "admin"); } /** * Grants administrator privileges to other users. Room owners may grant administrator * privileges to a member or unaffiliated user. An administrator is allowed to perform * administrative functions such as banning users and edit moderator list. * * @param jids the bare XMPP user IDs of the users to grant administrator privileges. * @throws XMPPException if an error occurs granting administrator privileges to a user. */ public void grantAdmin(Collection jids) throws XMPPException { changeAffiliationByOwner(jids, "admin"); } /** * Grants administrator privileges to another user. Room owners may grant administrator * privileges to a member or unaffiliated user. An administrator is allowed to perform * administrative functions such as banning users and edit moderator list. * * @param jid the bare XMPP user ID of the user to grant administrator privileges * (e.g. "user@host.org"). * @throws XMPPException if an error occurs granting administrator privileges to a user. */ public void grantAdmin(String jid) throws XMPPException { changeAffiliationByOwner(jid, "admin"); } /** * Revokes administrator privileges from users. The occupant that loses administrator * privileges will become a member. Room owners may revoke administrator privileges from * a member or unaffiliated user. * * @param jids the bare XMPP user IDs of the user to revoke administrator privileges. * @throws XMPPException if an error occurs revoking administrator privileges from a user. */ public void revokeAdmin(Collection jids) throws XMPPException { changeAffiliationByOwner(jids, "member"); } /** * Revokes administrator privileges from a user. The occupant that loses administrator * privileges will become a member. Room owners may revoke administrator privileges from * a member or unaffiliated user. * * @param jid the bare XMPP user ID of the user to revoke administrator privileges * (e.g. "user@host.org"). * @throws XMPPException if an error occurs revoking administrator privileges from a user. */ public void revokeAdmin(String jid) throws XMPPException { changeAffiliationByOwner(jid, "member"); } private void changeAffiliationByOwner(String jid, String affiliation) throws XMPPException { MUCOwner iq = new MUCOwner(); iq.setTo(room); iq.setType(IQ.Type.SET); // Set the new affiliation. MUCOwner.Item item = new MUCOwner.Item(affiliation); item.setJid(jid); iq.addItem(item); // Wait for a response packet back from the server. PacketFilter responseFilter = new PacketIDFilter(iq.getPacketID()); PacketCollector response = connection.createPacketCollector(responseFilter); // Send the change request to the server. connection.sendPacket(iq); // Wait up to a certain number of seconds for a reply. IQ answer = (IQ) response.nextResult(SmackConfiguration.getPacketReplyTimeout()); // Stop queuing results response.cancel(); if (answer == null) { throw new XMPPException("No response from server."); } else if (answer.getError() != null) { throw new XMPPException(answer.getError()); } } private void changeAffiliationByOwner(Collection jids, String affiliation) throws XMPPException { MUCOwner iq = new MUCOwner(); iq.setTo(room); iq.setType(IQ.Type.SET); for (String jid : jids) { // Set the new affiliation. MUCOwner.Item item = new MUCOwner.Item(affiliation); item.setJid(jid); iq.addItem(item); } // Wait for a response packet back from the server. PacketFilter responseFilter = new PacketIDFilter(iq.getPacketID()); PacketCollector response = connection.createPacketCollector(responseFilter); // Send the change request to the server. connection.sendPacket(iq); // Wait up to a certain number of seconds for a reply. IQ answer = (IQ) response.nextResult(SmackConfiguration.getPacketReplyTimeout()); // Stop queuing results response.cancel(); if (answer == null) { throw new XMPPException("No response from server."); } else if (answer.getError() != null) { throw new XMPPException(answer.getError()); } } private void changeAffiliationByAdmin(String jid, String affiliation, String reason) throws XMPPException { MUCAdmin iq = new MUCAdmin(); iq.setTo(room); iq.setType(IQ.Type.SET); // Set the new affiliation. MUCAdmin.Item item = new MUCAdmin.Item(affiliation, null); item.setJid(jid); item.setReason(reason); iq.addItem(item); // Wait for a response packet back from the server. PacketFilter responseFilter = new PacketIDFilter(iq.getPacketID()); PacketCollector response = connection.createPacketCollector(responseFilter); // Send the change request to the server. connection.sendPacket(iq); // Wait up to a certain number of seconds for a reply. IQ answer = (IQ) response.nextResult(SmackConfiguration.getPacketReplyTimeout()); // Stop queuing results response.cancel(); if (answer == null) { throw new XMPPException("No response from server."); } else if (answer.getError() != null) { throw new XMPPException(answer.getError()); } } private void changeAffiliationByAdmin(Collection jids, String affiliation) throws XMPPException { MUCAdmin iq = new MUCAdmin(); iq.setTo(room); iq.setType(IQ.Type.SET); for (String jid : jids) { // Set the new affiliation. MUCAdmin.Item item = new MUCAdmin.Item(affiliation, null); item.setJid(jid); iq.addItem(item); } // Wait for a response packet back from the server. PacketFilter responseFilter = new PacketIDFilter(iq.getPacketID()); PacketCollector response = connection.createPacketCollector(responseFilter); // Send the change request to the server. connection.sendPacket(iq); // Wait up to a certain number of seconds for a reply. IQ answer = (IQ) response.nextResult(SmackConfiguration.getPacketReplyTimeout()); // Stop queuing results response.cancel(); if (answer == null) { throw new XMPPException("No response from server."); } else if (answer.getError() != null) { throw new XMPPException(answer.getError()); } } private void changeRole(String nickname, String role, String reason) throws XMPPException { MUCAdmin iq = new MUCAdmin(); iq.setTo(room); iq.setType(IQ.Type.SET); // Set the new role. MUCAdmin.Item item = new MUCAdmin.Item(null, role); item.setNick(nickname); item.setReason(reason); iq.addItem(item); // Wait for a response packet back from the server. PacketFilter responseFilter = new PacketIDFilter(iq.getPacketID()); PacketCollector response = connection.createPacketCollector(responseFilter); // Send the change request to the server. connection.sendPacket(iq); // Wait up to a certain number of seconds for a reply. IQ answer = (IQ) response.nextResult(SmackConfiguration.getPacketReplyTimeout()); // Stop queuing results response.cancel(); if (answer == null) { throw new XMPPException("No response from server."); } else if (answer.getError() != null) { throw new XMPPException(answer.getError()); } } private void changeRole(Collection nicknames, String role) throws XMPPException { MUCAdmin iq = new MUCAdmin(); iq.setTo(room); iq.setType(IQ.Type.SET); for (String nickname : nicknames) { // Set the new role. MUCAdmin.Item item = new MUCAdmin.Item(null, role); item.setNick(nickname); iq.addItem(item); } // Wait for a response packet back from the server. PacketFilter responseFilter = new PacketIDFilter(iq.getPacketID()); PacketCollector response = connection.createPacketCollector(responseFilter); // Send the change request to the server. connection.sendPacket(iq); // Wait up to a certain number of seconds for a reply. IQ answer = (IQ) response.nextResult(SmackConfiguration.getPacketReplyTimeout()); // Stop queuing results response.cancel(); if (answer == null) { throw new XMPPException("No response from server."); } else if (answer.getError() != null) { throw new XMPPException(answer.getError()); } } /** * Returns the number of occupants in the group chat.

* * Note: this value will only be accurate after joining the group chat, and * may fluctuate over time. If you query this value directly after joining the * group chat it may not be accurate, as it takes a certain amount of time for * the server to send all presence packets to this client. * * @return the number of occupants in the group chat. */ public int getOccupantsCount() { return occupantsMap.size(); } /** * Returns an Iterator (of Strings) for the list of fully qualified occupants * in the group chat. For example, "conference@chat.jivesoftware.com/SomeUser". * Typically, a client would only display the nickname of the occupant. To * get the nickname from the fully qualified name, use the * {@link org.jivesoftware.smack.util.StringUtils#parseResource(String)} method. * Note: this value will only be accurate after joining the group chat, and may * fluctuate over time. * * @return an Iterator for the occupants in the group chat. */ public Iterator getOccupants() { return Collections.unmodifiableList(new ArrayList(occupantsMap.keySet())) .iterator(); } /** * Returns the presence info for a particular user, or null if the user * is not in the room.

* * @param user the room occupant to search for his presence. The format of user must * be: roomName@service/nickname (e.g. darkcave@macbeth.shakespeare.lit/thirdwitch). * @return the occupant's current presence, or null if the user is unavailable * or if no presence information is available. */ public Presence getOccupantPresence(String user) { return occupantsMap.get(user); } /** * Returns the Occupant information for a particular occupant, or null if the * user is not in the room. The Occupant object may include information such as full * JID of the user as well as the role and affiliation of the user in the room.

* * @param user the room occupant to search for his presence. The format of user must * be: roomName@service/nickname (e.g. darkcave@macbeth.shakespeare.lit/thirdwitch). * @return the Occupant or null if the user is unavailable (i.e. not in the room). */ public Occupant getOccupant(String user) { Presence presence = occupantsMap.get(user); if (presence != null) { return new Occupant(presence); } return null; } /** * Adds a packet listener that will be notified of any new Presence packets * sent to the group chat. Using a listener is a suitable way to know when the list * of occupants should be re-loaded due to any changes. * * @param listener a packet listener that will be notified of any presence packets * sent to the group chat. */ public void addParticipantListener(PacketListener listener) { connection.addPacketListener(listener, presenceFilter); connectionListeners.add(listener); } /** * Remoces a packet listener that was being notified of any new Presence packets * sent to the group chat. * * @param listener a packet listener that was being notified of any presence packets * sent to the group chat. */ public void removeParticipantListener(PacketListener listener) { connection.removePacketListener(listener); connectionListeners.remove(listener); } /** * Returns a collection of Affiliate with the room owners. * * @return a collection of Affiliate with the room owners. * @throws XMPPException if an error occured while performing the request to the server or you * don't have enough privileges to get this information. */ public Collection getOwners() throws XMPPException { return getAffiliatesByOwner("owner"); } /** * Returns a collection of Affiliate with the room administrators. * * @return a collection of Affiliate with the room administrators. * @throws XMPPException if an error occured while performing the request to the server or you * don't have enough privileges to get this information. */ public Collection getAdmins() throws XMPPException { return getAffiliatesByOwner("admin"); } /** * Returns a collection of Affiliate with the room members. * * @return a collection of Affiliate with the room members. * @throws XMPPException if an error occured while performing the request to the server or you * don't have enough privileges to get this information. */ public Collection getMembers() throws XMPPException { return getAffiliatesByAdmin("member"); } /** * Returns a collection of Affiliate with the room outcasts. * * @return a collection of Affiliate with the room outcasts. * @throws XMPPException if an error occured while performing the request to the server or you * don't have enough privileges to get this information. */ public Collection getOutcasts() throws XMPPException { return getAffiliatesByAdmin("outcast"); } /** * Returns a collection of Affiliate that have the specified room affiliation * sending a request in the owner namespace. * * @param affiliation the affiliation of the users in the room. * @return a collection of Affiliate that have the specified room affiliation. * @throws XMPPException if an error occured while performing the request to the server or you * don't have enough privileges to get this information. */ private Collection getAffiliatesByOwner(String affiliation) throws XMPPException { MUCOwner iq = new MUCOwner(); iq.setTo(room); iq.setType(IQ.Type.GET); // Set the specified affiliation. This may request the list of owners/admins/members/outcasts. MUCOwner.Item item = new MUCOwner.Item(affiliation); iq.addItem(item); // Wait for a response packet back from the server. PacketFilter responseFilter = new PacketIDFilter(iq.getPacketID()); PacketCollector response = connection.createPacketCollector(responseFilter); // Send the request to the server. connection.sendPacket(iq); // Wait up to a certain number of seconds for a reply. MUCOwner answer = (MUCOwner) response.nextResult(SmackConfiguration.getPacketReplyTimeout()); // Stop queuing results response.cancel(); if (answer == null) { throw new XMPPException("No response from server."); } else if (answer.getError() != null) { throw new XMPPException(answer.getError()); } // Get the list of affiliates from the server's answer List affiliates = new ArrayList(); for (Iterator it = answer.getItems(); it.hasNext();) { affiliates.add(new Affiliate((MUCOwner.Item) it.next())); } return affiliates; } /** * Returns a collection of Affiliate that have the specified room affiliation * sending a request in the admin namespace. * * @param affiliation the affiliation of the users in the room. * @return a collection of Affiliate that have the specified room affiliation. * @throws XMPPException if an error occured while performing the request to the server or you * don't have enough privileges to get this information. */ private Collection getAffiliatesByAdmin(String affiliation) throws XMPPException { MUCAdmin iq = new MUCAdmin(); iq.setTo(room); iq.setType(IQ.Type.GET); // Set the specified affiliation. This may request the list of owners/admins/members/outcasts. MUCAdmin.Item item = new MUCAdmin.Item(affiliation, null); iq.addItem(item); // Wait for a response packet back from the server. PacketFilter responseFilter = new PacketIDFilter(iq.getPacketID()); PacketCollector response = connection.createPacketCollector(responseFilter); // Send the request to the server. connection.sendPacket(iq); // Wait up to a certain number of seconds for a reply. MUCAdmin answer = (MUCAdmin) response.nextResult(SmackConfiguration.getPacketReplyTimeout()); // Stop queuing results response.cancel(); if (answer == null) { throw new XMPPException("No response from server."); } else if (answer.getError() != null) { throw new XMPPException(answer.getError()); } // Get the list of affiliates from the server's answer List affiliates = new ArrayList(); for (Iterator it = answer.getItems(); it.hasNext();) { affiliates.add(new Affiliate((MUCAdmin.Item) it.next())); } return affiliates; } /** * Returns a collection of Occupant with the room moderators. * * @return a collection of Occupant with the room moderators. * @throws XMPPException if an error occured while performing the request to the server or you * don't have enough privileges to get this information. */ public Collection getModerators() throws XMPPException { return getOccupants("moderator"); } /** * Returns a collection of Occupant with the room participants. * * @return a collection of Occupant with the room participants. * @throws XMPPException if an error occured while performing the request to the server or you * don't have enough privileges to get this information. */ public Collection getParticipants() throws XMPPException { return getOccupants("participant"); } /** * Returns a collection of Occupant that have the specified room role. * * @param role the role of the occupant in the room. * @return a collection of Occupant that have the specified room role. * @throws XMPPException if an error occured while performing the request to the server or you * don't have enough privileges to get this information. */ private Collection getOccupants(String role) throws XMPPException { MUCAdmin iq = new MUCAdmin(); iq.setTo(room); iq.setType(IQ.Type.GET); // Set the specified role. This may request the list of moderators/participants. MUCAdmin.Item item = new MUCAdmin.Item(null, role); iq.addItem(item); // Wait for a response packet back from the server. PacketFilter responseFilter = new PacketIDFilter(iq.getPacketID()); PacketCollector response = connection.createPacketCollector(responseFilter); // Send the request to the server. connection.sendPacket(iq); // Wait up to a certain number of seconds for a reply. MUCAdmin answer = (MUCAdmin) response.nextResult(SmackConfiguration.getPacketReplyTimeout()); // Stop queuing results response.cancel(); if (answer == null) { throw new XMPPException("No response from server."); } else if (answer.getError() != null) { throw new XMPPException(answer.getError()); } // Get the list of participants from the server's answer List participants = new ArrayList(); for (Iterator it = answer.getItems(); it.hasNext();) { participants.add(new Occupant((MUCAdmin.Item) it.next())); } return participants; } /** * Sends a message to the chat room. * * @param text the text of the message to send. * @throws XMPPException if sending the message fails. */ public void sendMessage(String text) throws XMPPException { Message message = new Message(room, Message.Type.GROUP_CHAT); message.setBody(text); connection.sendPacket(message); } /** * Returns a new Chat for sending private messages to a given room occupant. * The Chat's occupant address is the room's JID (i.e. roomName@service/nick). The server * service will change the 'from' address to the sender's room JID and delivering the message * to the intended recipient's full JID. * * @param occupant occupant unique room JID (e.g. 'darkcave@macbeth.shakespeare.lit/Paul'). * @return new Chat for sending private messages to a given room occupant. */ public Chat createPrivateChat(String occupant) { return new Chat(connection, occupant); } /** * Creates a new Message to send to the chat room. * * @return a new Message addressed to the chat room. */ public Message createMessage() { return new Message(room, Message.Type.GROUP_CHAT); } /** * Sends a Message to the chat room. * * @param message the message. * @throws XMPPException if sending the message fails. */ public void sendMessage(Message message) throws XMPPException { connection.sendPacket(message); } /** * Polls for and returns the next message, or null if there isn't * a message immediately available. This method provides significantly different * functionalty than the {@link #nextMessage()} method since it's non-blocking. * In other words, the method call will always return immediately, whereas the * nextMessage method will return only when a message is available (or after * a specific timeout). * * @return the next message if one is immediately available and * null otherwise. */ public Message pollMessage() { return (Message) messageCollector.pollResult(); } /** * Returns the next available message in the chat. The method call will block * (not return) until a message is available. * * @return the next message. */ public Message nextMessage() { return (Message) messageCollector.nextResult(); } /** * Returns the next available message in the chat. The method call will block * (not return) until a packet is available or the timeout has elapased. * If the timeout elapses without a result, null will be returned. * * @param timeout the maximum amount of time to wait for the next message. * @return the next message, or null if the timeout elapses without a * message becoming available. */ public Message nextMessage(long timeout) { return (Message) messageCollector.nextResult(timeout); } /** * Adds a packet listener that will be notified of any new messages in the * group chat. Only "group chat" messages addressed to this group chat will * be delivered to the listener. If you wish to listen for other packets * that may be associated with this group chat, you should register a * PacketListener directly with the XMPPConnection with the appropriate * PacketListener. * * @param listener a packet listener. */ public void addMessageListener(PacketListener listener) { connection.addPacketListener(listener, messageFilter); connectionListeners.add(listener); } /** * Removes a packet listener that was being notified of any new messages in the * multi user chat. Only "group chat" messages addressed to this multi user chat were * being delivered to the listener. * * @param listener a packet listener. */ public void removeMessageListener(PacketListener listener) { connection.removePacketListener(listener); connectionListeners.remove(listener); } /** * Changes the subject within the room. As a default, only users with a role of "moderator" * are allowed to change the subject in a room. Although some rooms may be configured to * allow a mere participant or even a visitor to change the subject. * * @param subject the new room's subject to set. * @throws XMPPException if someone without appropriate privileges attempts to change the * room subject will throw an error with code 403 (i.e. Forbidden) */ public void changeSubject(final String subject) throws XMPPException { Message message = new Message(room, Message.Type.GROUP_CHAT); message.setSubject(subject); // Wait for an error or confirmation message back from the server. PacketFilter responseFilter = new AndFilter( new FromMatchesFilter(room), new PacketTypeFilter(Message.class)); responseFilter = new AndFilter(responseFilter, new PacketFilter() { public boolean accept(Packet packet) { Message msg = (Message) packet; return subject.equals(msg.getSubject()); } }); PacketCollector response = connection.createPacketCollector(responseFilter); // Send change subject packet. connection.sendPacket(message); // Wait up to a certain number of seconds for a reply. Message answer = (Message) response.nextResult(SmackConfiguration.getPacketReplyTimeout()); // Stop queuing results response.cancel(); if (answer == null) { throw new XMPPException("No response from server."); } else if (answer.getError() != null) { throw new XMPPException(answer.getError()); } } /** * Notification message that the user has joined the room. */ private synchronized void userHasJoined() { // Update the list of joined rooms through this connection List rooms = joinedRooms.get(connection); if (rooms == null) { rooms = new ArrayList(); joinedRooms.put(connection, rooms); } rooms.add(room); } /** * Notification message that the user has left the room. */ private synchronized void userHasLeft() { // Update the list of joined rooms through this connection List rooms = joinedRooms.get(connection); if (rooms == null) { return; } rooms.remove(room); } /** * Returns the MUCUser packet extension included in the packet or null if none. * * @param packet the packet that may include the MUCUser extension. * @return the MUCUser found in the packet. */ private MUCUser getMUCUserExtension(Packet packet) { if (packet != null) { // Get the MUC User extension return (MUCUser) packet.getExtension("x", "http://jabber.org/protocol/muc#user"); } return null; } /** * Adds a listener that will be notified of changes in your status in the room * such as the user being kicked, banned, or granted admin permissions. * * @param listener a user status listener. */ public void addUserStatusListener(UserStatusListener listener) { synchronized (userStatusListeners) { if (!userStatusListeners.contains(listener)) { userStatusListeners.add(listener); } } } /** * Removes a listener that was being notified of changes in your status in the room * such as the user being kicked, banned, or granted admin permissions. * * @param listener a user status listener. */ public void removeUserStatusListener(UserStatusListener listener) { synchronized (userStatusListeners) { userStatusListeners.remove(listener); } } private void fireUserStatusListeners(String methodName, Object[] params) { UserStatusListener[] listeners; synchronized (userStatusListeners) { listeners = new UserStatusListener[userStatusListeners.size()]; userStatusListeners.toArray(listeners); } // Get the classes of the method parameters Class[] paramClasses = new Class[params.length]; for (int i = 0; i < params.length; i++) { paramClasses[i] = params[i].getClass(); } try { // Get the method to execute based on the requested methodName and parameters classes Method method = UserStatusListener.class.getDeclaredMethod(methodName, paramClasses); for (UserStatusListener listener : listeners) { method.invoke(listener, params); } } catch (NoSuchMethodException e) { e.printStackTrace(); } catch (InvocationTargetException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } } /** * Adds a listener that will be notified of changes in occupants status in the room * such as the user being kicked, banned, or granted admin permissions. * * @param listener a participant status listener. */ public void addParticipantStatusListener(ParticipantStatusListener listener) { synchronized (participantStatusListeners) { if (!participantStatusListeners.contains(listener)) { participantStatusListeners.add(listener); } } } /** * Removes a listener that was being notified of changes in occupants status in the room * such as the user being kicked, banned, or granted admin permissions. * * @param listener a participant status listener. */ public void removeParticipantStatusListener(ParticipantStatusListener listener) { synchronized (participantStatusListeners) { participantStatusListeners.remove(listener); } } private void fireParticipantStatusListeners(String methodName, List params) { ParticipantStatusListener[] listeners; synchronized (participantStatusListeners) { listeners = new ParticipantStatusListener[participantStatusListeners.size()]; participantStatusListeners.toArray(listeners); } try { // Get the method to execute based on the requested methodName and parameter Class[] classes = new Class[params.size()]; for (int i=0;i params = new ArrayList(); params.add(from); fireParticipantStatusListeners("joined", params); } } } else if (presence.getType() == Presence.Type.unavailable) { occupantsMap.remove(from); MUCUser mucUser = getMUCUserExtension(presence); if (mucUser != null && mucUser.getStatus() != null) { // Fire events according to the received presence code checkPresenceCode( mucUser.getStatus().getCode(), presence.getFrom().equals(myRoomJID), mucUser, from); } else { // An occupant has left the room if (!isUserStatusModification) { List params = new ArrayList(); params.add(from); fireParticipantStatusListeners("left", params); } } } } }; // Listens for all messages that include a MUCUser extension and fire the invitation // rejection listeners if the message includes an invitation rejection. PacketListener declinesListener = new PacketListener() { public void processPacket(Packet packet) { // Get the MUC User extension MUCUser mucUser = getMUCUserExtension(packet); // Check if the MUCUser informs that the invitee has declined the invitation if (mucUser.getDecline() != null && ((Message) packet).getType() != Message.Type.ERROR) { // Fire event for invitation rejection listeners fireInvitationRejectionListeners( mucUser.getDecline().getFrom(), mucUser.getDecline().getReason()); } } }; PacketMultiplexListener packetMultiplexor = new PacketMultiplexListener( messageCollector, presenceListener, subjectListener, declinesListener); roomListenerMultiplexor = RoomListenerMultiplexor.getRoomMultiplexor(connection); roomListenerMultiplexor.addRoom(room, packetMultiplexor); } /** * Fires notification events if the role of a room occupant has changed. If the occupant that * changed his role is your occupant then the UserStatusListeners added to this * MultiUserChat will be fired. On the other hand, if the occupant that changed * his role is not yours then the ParticipantStatusListeners added to this * MultiUserChat will be fired. The following table shows the events that will * be fired depending on the previous and new role of the occupant. * *

     * 
     * 
     *
     * 
     * 
     * 
     *
     * 
     * 
     * 
     *
     * 
     * 
     * 
     *
     * 
     * 
     * 
     * 
OldNewEvents
NoneVisitor--
VisitorParticipantvoiceGranted
ParticipantModeratormoderatorGranted
NoneParticipantvoiceGranted
NoneModeratorvoiceGranted + moderatorGranted
VisitorModeratorvoiceGranted + moderatorGranted
ModeratorParticipantmoderatorRevoked
ParticipantVisitorvoiceRevoked
VisitorNonekicked
ModeratorVisitorvoiceRevoked + moderatorRevoked
ModeratorNonekicked
ParticipantNonekicked
*
* * @param oldRole the previous role of the user in the room before receiving the new presence * @param newRole the new role of the user in the room after receiving the new presence * @param isUserModification whether the received presence is about your user in the room or not * @param from the occupant whose role in the room has changed * (e.g. room@conference.jabber.org/nick). */ private void checkRoleModifications( String oldRole, String newRole, boolean isUserModification, String from) { // Voice was granted to a visitor if (("visitor".equals(oldRole) || "none".equals(oldRole)) && "participant".equals(newRole)) { if (isUserModification) { fireUserStatusListeners("voiceGranted", new Object[] {}); } else { List params = new ArrayList(); params.add(from); fireParticipantStatusListeners("voiceGranted", params); } } // The participant's voice was revoked from the room else if ( "participant".equals(oldRole) && ("visitor".equals(newRole) || "none".equals(newRole))) { if (isUserModification) { fireUserStatusListeners("voiceRevoked", new Object[] {}); } else { List params = new ArrayList(); params.add(from); fireParticipantStatusListeners("voiceRevoked", params); } } // Moderator privileges were granted to a participant if (!"moderator".equals(oldRole) && "moderator".equals(newRole)) { if ("visitor".equals(oldRole) || "none".equals(oldRole)) { if (isUserModification) { fireUserStatusListeners("voiceGranted", new Object[] {}); } else { List params = new ArrayList(); params.add(from); fireParticipantStatusListeners("voiceGranted", params); } } if (isUserModification) { fireUserStatusListeners("moderatorGranted", new Object[] {}); } else { List params = new ArrayList(); params.add(from); fireParticipantStatusListeners("moderatorGranted", params); } } // Moderator privileges were revoked from a participant else if ("moderator".equals(oldRole) && !"moderator".equals(newRole)) { if ("visitor".equals(newRole) || "none".equals(newRole)) { if (isUserModification) { fireUserStatusListeners("voiceRevoked", new Object[] {}); } else { List params = new ArrayList(); params.add(from); fireParticipantStatusListeners("voiceRevoked", params); } } if (isUserModification) { fireUserStatusListeners("moderatorRevoked", new Object[] {}); } else { List params = new ArrayList(); params.add(from); fireParticipantStatusListeners("moderatorRevoked", params); } } } /** * Fires notification events if the affiliation of a room occupant has changed. If the * occupant that changed his affiliation is your occupant then the * UserStatusListeners added to this MultiUserChat will be fired. * On the other hand, if the occupant that changed his affiliation is not yours then the * ParticipantStatusListeners added to this MultiUserChat will be * fired. The following table shows the events that will be fired depending on the previous * and new affiliation of the occupant. * *
     * 
     * 
     *
     * 
     * 
     * 
     *
     * 
     * 
     * 
     *
     * 
     * 
     * 
     *
     * 
     * 
     * 
     * 
     * 
OldNewEvents
NoneMembermembershipGranted
MemberAdminmembershipRevoked + adminGranted
AdminOwneradminRevoked + ownershipGranted
NoneAdminadminGranted
NoneOwnerownershipGranted
MemberOwnermembershipRevoked + ownershipGranted
OwnerAdminownershipRevoked + adminGranted
AdminMemberadminRevoked + membershipGranted
MemberNonemembershipRevoked
OwnerMemberownershipRevoked + membershipGranted
OwnerNoneownershipRevoked
AdminNoneadminRevoked
AnyoneOutcastbanned
*
* * @param oldAffiliation the previous affiliation of the user in the room before receiving the * new presence * @param newAffiliation the new affiliation of the user in the room after receiving the new * presence * @param isUserModification whether the received presence is about your user in the room or not * @param from the occupant whose role in the room has changed * (e.g. room@conference.jabber.org/nick). */ private void checkAffiliationModifications( String oldAffiliation, String newAffiliation, boolean isUserModification, String from) { // First check for revoked affiliation and then for granted affiliations. The idea is to // first fire the "revoke" events and then fire the "grant" events. // The user's ownership to the room was revoked if ("owner".equals(oldAffiliation) && !"owner".equals(newAffiliation)) { if (isUserModification) { fireUserStatusListeners("ownershipRevoked", new Object[] {}); } else { List params = new ArrayList(); params.add(from); fireParticipantStatusListeners("ownershipRevoked", params); } } // The user's administrative privileges to the room were revoked else if ("admin".equals(oldAffiliation) && !"admin".equals(newAffiliation)) { if (isUserModification) { fireUserStatusListeners("adminRevoked", new Object[] {}); } else { List params = new ArrayList(); params.add(from); fireParticipantStatusListeners("adminRevoked", params); } } // The user's membership to the room was revoked else if ("member".equals(oldAffiliation) && !"member".equals(newAffiliation)) { if (isUserModification) { fireUserStatusListeners("membershipRevoked", new Object[] {}); } else { List params = new ArrayList(); params.add(from); fireParticipantStatusListeners("membershipRevoked", params); } } // The user was granted ownership to the room if (!"owner".equals(oldAffiliation) && "owner".equals(newAffiliation)) { if (isUserModification) { fireUserStatusListeners("ownershipGranted", new Object[] {}); } else { List params = new ArrayList(); params.add(from); fireParticipantStatusListeners("ownershipGranted", params); } } // The user was granted administrative privileges to the room else if (!"admin".equals(oldAffiliation) && "admin".equals(newAffiliation)) { if (isUserModification) { fireUserStatusListeners("adminGranted", new Object[] {}); } else { List params = new ArrayList(); params.add(from); fireParticipantStatusListeners("adminGranted", params); } } // The user was granted membership to the room else if (!"member".equals(oldAffiliation) && "member".equals(newAffiliation)) { if (isUserModification) { fireUserStatusListeners("membershipGranted", new Object[] {}); } else { List params = new ArrayList(); params.add(from); fireParticipantStatusListeners("membershipGranted", params); } } } /** * Fires events according to the received presence code. * * @param code * @param isUserModification * @param mucUser * @param from */ private void checkPresenceCode( String code, boolean isUserModification, MUCUser mucUser, String from) { // Check if an occupant was kicked from the room if ("307".equals(code)) { // Check if this occupant was kicked if (isUserModification) { joined = false; fireUserStatusListeners( "kicked", new Object[] { mucUser.getItem().getActor(), mucUser.getItem().getReason()}); // Reset occupant information. occupantsMap.clear(); nickname = null; userHasLeft(); } else { List params = new ArrayList(); params.add(from); params.add(mucUser.getItem().getActor()); params.add(mucUser.getItem().getReason()); fireParticipantStatusListeners("kicked", params); } } // A user was banned from the room else if ("301".equals(code)) { // Check if this occupant was banned if (isUserModification) { joined = false; fireUserStatusListeners( "banned", new Object[] { mucUser.getItem().getActor(), mucUser.getItem().getReason()}); // Reset occupant information. occupantsMap.clear(); nickname = null; userHasLeft(); } else { List params = new ArrayList(); params.add(from); params.add(mucUser.getItem().getActor()); params.add(mucUser.getItem().getReason()); fireParticipantStatusListeners("banned", params); } } // A user's membership was revoked from the room else if ("321".equals(code)) { // Check if this occupant's membership was revoked if (isUserModification) { joined = false; fireUserStatusListeners("membershipRevoked", new Object[] {}); // Reset occupant information. occupantsMap.clear(); nickname = null; userHasLeft(); } } // A occupant has changed his nickname in the room else if ("303".equals(code)) { List params = new ArrayList(); params.add(from); params.add(mucUser.getItem().getNick()); fireParticipantStatusListeners("nicknameChanged", params); } } public void finalize() throws Throwable { super.finalize(); try { if (connection != null) { roomListenerMultiplexor.removeRoom(room); // Remove all the PacketListeners added to the connection by this chat for (PacketListener connectionListener : connectionListeners) { connection.removePacketListener(connectionListener); } } } catch (Exception e) { // Do nothing } } /** * An InvitationsMonitor monitors a given connection to detect room invitations. Every * time the InvitationsMonitor detects a new invitation it will fire the invitation listeners. * * @author Gaston Dombiak */ private static class InvitationsMonitor implements ConnectionListener { // We use a WeakHashMap so that the GC can collect the monitor when the // connection is no longer referenced by any object. private final static Map> monitors = new WeakHashMap>(); private final List invitationsListeners = new ArrayList(); private XMPPConnection connection; private PacketFilter invitationFilter; private PacketListener invitationPacketListener; /** * Returns a new or existing InvitationsMonitor for a given connection. * * @param conn the connection to monitor for room invitations. * @return a new or existing InvitationsMonitor for a given connection. */ public static InvitationsMonitor getInvitationsMonitor(XMPPConnection conn) { synchronized (monitors) { if (!monitors.containsKey(conn)) { // We need to use a WeakReference because the monitor references the // connection and this could prevent the GC from collecting the monitor // when no other object references the monitor monitors.put(conn, new WeakReference(new InvitationsMonitor(conn))); } // Return the InvitationsMonitor that monitors the connection return monitors.get(conn).get(); } } /** * Creates a new InvitationsMonitor that will monitor invitations received * on a given connection. * * @param connection the connection to monitor for possible room invitations */ private InvitationsMonitor(XMPPConnection connection) { this.connection = connection; } /** * Adds a listener to invitation notifications. The listener will be fired anytime * an invitation is received.

* * If this is the first monitor's listener then the monitor will be initialized in * order to start listening to room invitations. * * @param listener an invitation listener. */ public void addInvitationListener(InvitationListener listener) { synchronized (invitationsListeners) { // If this is the first monitor's listener then initialize the listeners // on the connection to detect room invitations if (invitationsListeners.size() == 0) { init(); } if (!invitationsListeners.contains(listener)) { invitationsListeners.add(listener); } } } /** * Removes a listener to invitation notifications. The listener will be fired anytime * an invitation is received.

* * If there are no more listeners to notifiy for room invitations then the monitor will * be stopped. As soon as a new listener is added to the monitor, the monitor will resume * monitoring the connection for new room invitations. * * @param listener an invitation listener. */ public void removeInvitationListener(InvitationListener listener) { synchronized (invitationsListeners) { if (invitationsListeners.contains(listener)) { invitationsListeners.remove(listener); } // If there are no more listeners to notifiy for room invitations // then proceed to cancel/release this monitor if (invitationsListeners.size() == 0) { cancel(); } } } /** * Fires invitation listeners. */ private void fireInvitationListeners(String room, String inviter, String reason, String password, Message message) { InvitationListener[] listeners; synchronized (invitationsListeners) { listeners = new InvitationListener[invitationsListeners.size()]; invitationsListeners.toArray(listeners); } for (InvitationListener listener : listeners) { listener.invitationReceived(connection, room, inviter, reason, password, message); } } public void connectionClosed() { cancel(); } public void connectionClosedOnError(Exception e) { cancel(); } public void reconnectingIn(int seconds) { // ignore } public void reconnectionSuccessful() { // ignore } public void reconnectionFailed(Exception e) { // ignore } /** * Initializes the listeners to detect received room invitations and to detect when the * connection gets closed. As soon as a room invitation is received the invitations * listeners will be fired. When the connection gets closed the monitor will remove * his listeners on the connection. */ private void init() { // Listens for all messages that include a MUCUser extension and fire the invitation // listeners if the message includes an invitation. invitationFilter = new PacketExtensionFilter("x", "http://jabber.org/protocol/muc#user"); invitationPacketListener = new PacketListener() { public void processPacket(Packet packet) { // Get the MUCUser extension MUCUser mucUser = (MUCUser) packet.getExtension("x", "http://jabber.org/protocol/muc#user"); // Check if the MUCUser extension includes an invitation if (mucUser.getInvite() != null && ((Message) packet).getType() != Message.Type.ERROR) { // Fire event for invitation listeners fireInvitationListeners(packet.getFrom(), mucUser.getInvite().getFrom(), mucUser.getInvite().getReason(), mucUser.getPassword(), (Message) packet); } } }; connection.addPacketListener(invitationPacketListener, invitationFilter); // Add a listener to detect when the connection gets closed in order to // cancel/release this monitor connection.addConnectionListener(this); } /** * Cancels all the listeners that this InvitationsMonitor has added to the connection. */ private void cancel() { connection.removePacketListener(invitationPacketListener); connection.removeConnectionListener(this); } } }